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JEE PHYSICS MCQ: SYSTEM OF PARTICLES

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A circular disc is rotating about its natural axis with
angular velocity of 20 rad/s. A second disc of same
mass gently placed on it co-axially. If the radius of
disc is half of the radius of the first, then they will
start rotating with angular velocity of

View answer and explanation

Correct option: D

16 rad/s

The correct answer is D (16 rad/s) because angular momentum is conserved when the second disc is placed on the first.

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t = 1\,sec

\left( {rad\,{s^{ - 2}}} \right)